Arrange the followingin the orderof increasingionization enthalpy : (i) 1 s^(2)2s^(2)2p^(6) 3s^(2)(ii)1s^(2) 2s^(2)2p^(6)3s^(1)(iii)1s^(2)2s^(2)2p^(6)(iv)1s^(2)2s^(2)2p^(2)(v)1s^(2)2s^(2)2p^(3)

Arrange the followingin the orderof increasingionization enthalpy : (

1.	Arrange the followingin the orderof increasingionization enthalpy : (i) 1 s^(2)2s^(2)2p^(6) 3s^(2)(ii)1s^(2) 2s^(2)2p^(6)3s^(1)(iii)1s^(2)2s^(2)2p^(6)(iv)1s^(2)2s^(2)2p^(2)(v)1s^(2)2s^(2)2p^(3)
Answer» Solution :In a periodnoblegas i.e., `1S^(2) 2s^(2) 2p^(6) ` (iii)has thehighest`Delta_(i) H_(1)` Out of `C, 1s^(2) 2s^(2) 2p^(2) ` (iv) and `N 1s^(2) 2s^(2) 2p^(3) ` (v)N hashigher `Delta_(i)H_(1)` due tohighernuclearchangeand stableexactlyhalf-filledelectronicconfiguration Becauseof bigger size bothmg `1s^(2) 2s^(2) 2p^(6) 3s^(2)` (i) and Na `1s^(2) 2s^(2)2p^(6) 3s^(1)` (ii) havelower `Delta_(i)H_(1) ` than C, N, O. Out (i)and (ii), (i)has highest `Delta_(i)H_(1)` due tohighernuclearchargeadn completelyfilleds- ORBITAL. Thus, theoverallorderof increasing`Delta_(i)H_(1) ` is(iii) `lt(i) lt (iv) lt (v) lt (iii)`